900 Amp Cable Size at 20 Meters (415V Three-Phase (UK / Australia Industrial))
IEC 60364-5-52 metric conductor sizing (mm²), voltage drop, and power loss calculation for 900 A over 20 m (65.6 ft).
Copper Cable (≤3% Drop)2× 400 mm²Drop: 0.83V (0.2%)
Aluminum Cable (≤3% Drop)400 mm²Drop: 2.75V (0.66%)
Voltage at Load414.2 VLine Loss: 1300.0 W
Max Power & Breaker646.92 kW1000A MCB/MCCB
IEC 60364 Cable Cross-Section Table (1.5 mm² – 400 mm²) for 900A at 20m
| Cross-Section (mm²) | Cu Ampacity | Al Ampacity | Cu Voltage Drop | Load Voltage | Al Voltage Drop | Power Loss | Status |
|---|---|---|---|---|---|---|---|
| 1.5 mm² | 16 A | 12 A | 444.79 V (107.18%) | 0.0 V | 733.7 V (176.79%) | 693360.0 W | Drop High |
| 2.5 mm² | 24 A | 18 A | 266.87 V (64.31%) | 148.1 V | 440.22 V (106.08%) | 416016.0 W | Drop High |
| 4 mm² | 32 A | 25 A | 166.8 V (40.19%) | 248.2 V | 275.14 V (66.3%) | 260010.0 W | Drop High |
| 6 mm² | 41 A | 32 A | 111.2 V (26.79%) | 303.8 V | 183.42 V (44.2%) | 173340.0 W | Drop High |
| 10 mm² | 57 A | 44 A | 66.72 V (16.08%) | 348.3 V | 110.05 V (26.52%) | 104004.0 W | Drop High |
| 16 mm² | 76 A | 59 A | 41.7 V (10.05%) | 373.3 V | 68.78 V (16.57%) | 65002.5 W | Drop High |
| 25 mm² | 101 A | 78 A | 26.69 V (6.43%) | 388.3 V | 44.02 V (10.61%) | 41601.6 W | Drop High |
| 35 mm² | 125 A | 97 A | 19.06 V (4.59%) | 395.9 V | 31.44 V (7.58%) | 29715.4 W | Drop High |
| 50 mm² | 151 A | 118 A | 13.34 V (3.22%) | 401.7 V | 22.01 V (5.3%) | 20800.8 W | Drop High |
| 70 mm² | 192 A | 150 A | 9.53 V (2.3%) | 405.5 V | 15.72 V (3.79%) | 14857.7 W | Drop High |
| 95 mm² | 232 A | 181 A | 7.02 V (1.69%) | 408.0 V | 11.58 V (2.79%) | 10947.8 W | Drop High |
| 120 mm² | 269 A | 210 A | 5.56 V (1.34%) | 409.4 V | 9.17 V (2.21%) | 8667.0 W | Drop High |
| 150 mm² | 309 A | 241 A | 4.45 V (1.07%) | 410.6 V | 7.34 V (1.77%) | 6933.6 W | Drop High |
| 185 mm² | 353 A | 275 A | 3.61 V (0.87%) | 411.4 V | 5.95 V (1.43%) | 5621.8 W | Drop High |
| 240 mm² | 415 A | 324 A | 2.78 V (0.67%) | 412.2 V | 4.59 V (1.1%) | 4333.5 W | Drop High |
| 300 mm² | 477 A | 372 A | 2.22 V (0.54%) | 412.8 V | 3.67 V (0.88%) | 3466.8 W | Drop High |
| 400 mm² | 570 A | 445 A | 1.67 V (0.4%) | 413.3 V | 2.75 V (0.66%) | 2600.1 W | Drop High |
FAQ — 900 Amp Cable Size at 20 Meters (415V Three-Phase (UK / Australia Industrial))
What mm² cable size is required for 900A at 20 meters (415V)?
According to IEC 60364-5-52 ampacity and the 3% maximum voltage drop standard, you need 2× 400 mm² copper cable for 900A over 20m at 415V (voltage drop: 0.83V or 0.2%).
What is the power capacity of 900A at 415V?
At unity power factor, 900A at 415V supports 646.92 kW with a standard 1000A circuit breaker.
Related Lengths & Currents (415V)
900A · 5m (415V)900A · 10m (415V)900A · 15m (415V)900A · 25m (415V)900A · 30m (415V)900A · 35m (415V)900A · 40m (415V)900A · 45m (415V)900A · 50m (415V)900A · 60m (415V)900A · 70m (415V)10A · 20m (415V)16A · 20m (415V)20A · 20m (415V)25A · 20m (415V)32A · 20m (415V)40A · 20m (415V)50A · 20m (415V)63A · 20m (415V)80A · 20m (415V)100A · 20m (415V)125A · 20m (415V)160A · 20m (415V)200A · 20m (415V)